diff --git a/perl-xCAT/perl-xCAT.spec b/perl-xCAT/perl-xCAT.spec
index faa009ba4..c8de4c5f3 100644
--- a/perl-xCAT/perl-xCAT.spec
+++ b/perl-xCAT/perl-xCAT.spec
@@ -105,6 +105,18 @@ rm -rf $RPM_BUILD_ROOT
 # Just package everything that has been copied into RPM_BUILD_ROOT
 %{prefix}
 
+%pre
+# only need to check on AIX
+%ifnos linux
+if [ -x /usr/sbin/emgr ]; then          # Check for emgr cmd
+	/usr/sbin/emgr -l 2>&1 |  grep -i xCAT   # Test for any xcat ifixes -  msg and exit if found
+	if [ $? = 0 ]; then
+		echo "Error: One or more xCAT emgr ifixes are installed. You must use the /usr/sbin/emgr command to uninstall each xCAT emgr ifix prior to RPM installation."
+		exit 2
+	fi
+fi
+%endif
+
 %post
 %ifos linux
 if [ "$1" -gt 1 ]; then #Ugrade only, restart daemon and migrate settings
diff --git a/xCAT-IBMhpc/xCAT-IBMhpc.spec b/xCAT-IBMhpc/xCAT-IBMhpc.spec
index 284b5ce4b..3bf81c822 100644
--- a/xCAT-IBMhpc/xCAT-IBMhpc.spec
+++ b/xCAT-IBMhpc/xCAT-IBMhpc.spec
@@ -66,6 +66,18 @@ rm -rf $RPM_BUILD_ROOT
 
 %changelog
 
+%pre
+# only need to check on AIX
+%ifnos linux
+if [ -x /usr/sbin/emgr ]; then          # Check for emgr cmd
+	/usr/sbin/emgr -l 2>&1 |  grep -i xCAT   # Test for any xcat ifixes -  msg and exit if found
+	if [ $? = 0 ]; then
+		echo "Error: One or more xCAT emgr ifixes are installed. You must use the /usr/sbin/emgr command to uninstall each xCAT emgr ifix prior to RPM installation."
+		exit 2
+	fi
+fi
+%endif
+
 %post
 
 %preun
diff --git a/xCAT-client/xCAT-client.spec b/xCAT-client/xCAT-client.spec
index 67634da09..b5bde21d3 100644
--- a/xCAT-client/xCAT-client.spec
+++ b/xCAT-client/xCAT-client.spec
@@ -218,6 +218,18 @@ rm -rf $RPM_BUILD_ROOT
 * Tue Feb 20 2007 Jarrod Johnson <jbjohnso@us.ibm.com>
 - Start core rpm for 1.3 work
 
+%pre
+# only need to check on AIX
+%ifnos linux
+if [ -x /usr/sbin/emgr ]; then          # Check for emgr cmd
+	/usr/sbin/emgr -l 2>&1 |  grep -i xCAT   # Test for any xcat ifixes -  msg and exit if found
+	if [ $? = 0 ]; then
+		echo "Error: One or more xCAT emgr ifixes are installed. You must use the /usr/sbin/emgr command to uninstall each xCAT emgr ifix prior to RPM installation."
+		exit 2
+	fi
+fi
+%endif
+
 %post
 %ifos linux
 cat << EOF > /etc/profile.d/xcat.sh
diff --git a/xCAT-rmc/xCAT-rmc.spec b/xCAT-rmc/xCAT-rmc.spec
index fa413d801..9cad908f7 100644
--- a/xCAT-rmc/xCAT-rmc.spec
+++ b/xCAT-rmc/xCAT-rmc.spec
@@ -54,6 +54,18 @@ rm -rf $RPM_BUILD_ROOT
 
 %changelog
 
+%pre
+# only need to check on AIX
+%ifnos linux
+if [ -x /usr/sbin/emgr ]; then          # Check for emgr cmd
+	/usr/sbin/emgr -l 2>&1 |  grep -i xCAT   # Test for any xcat ifixes -  msg and exit if found
+	if [ $? = 0 ]; then
+		echo "Error: One or more xCAT emgr ifixes are installed. You must use the /usr/sbin/emgr command to uninstall each xCAT emgr ifix prior to RPM installation."
+		exit 2
+	fi
+fi
+%endif
+
 %post
 needCopyFiles=0
 if [ -f /etc/xCATMN ]; then
diff --git a/xCAT-server/xCAT-server.spec b/xCAT-server/xCAT-server.spec
index 3b26a247e..16124a4b5 100644
--- a/xCAT-server/xCAT-server.spec
+++ b/xCAT-server/xCAT-server.spec
@@ -250,6 +250,18 @@ rm -rf $RPM_BUILD_ROOT
 * Tue Feb 20 2007 Jarrod Johnson <jbjohnso@us.ibm.com>
 - Start core rpm for 1.3 work
 
+%pre
+# only need to check on AIX
+%ifnos linux
+if [ -x /usr/sbin/emgr ]; then          # Check for emgr cmd
+	/usr/sbin/emgr -l 2>&1 |  grep -i xCAT   # Test for any xcat ifixes -  msg and exit if found
+	if [ $? = 0 ]; then
+		echo "Error: One or more xCAT emgr ifixes are installed. You must use the /usr/sbin/emgr command to uninstall each xCAT emgr ifix prior to RPM installation."
+		exit 2
+	fi
+fi
+%endif
+
 %post
 %ifos linux
 ln -sf $RPM_INSTALL_PREFIX0/sbin/xcatd /usr/sbin/xcatd
diff --git a/xCAT/xCAT.spec b/xCAT/xCAT.spec
index 560abe6fe..330a77be4 100644
--- a/xCAT/xCAT.spec
+++ b/xCAT/xCAT.spec
@@ -123,6 +123,18 @@ cp %{SOURCE5} $RPM_BUILD_ROOT/etc/xCATMN
 mkdir -p $RPM_BUILD_ROOT/%{prefix}/share/doc/packages/xCAT
 cp LICENSE.html $RPM_BUILD_ROOT/%{prefix}/share/doc/packages/xCAT
 
+%pre
+# only need to check on AIX
+%ifnos linux
+if [ -x /usr/sbin/emgr ]; then          # Check for emgr cmd
+	/usr/sbin/emgr -l 2>&1 |  grep -i xCAT   # Test for any xcat ifixes -  msg and exit if found
+	if [ $? = 0 ]; then
+		echo "Error: One or more xCAT emgr ifixes are installed. You must use the /usr/sbin/emgr command to uninstall each xCAT emgr ifix prior to RPM installation."
+		exit 2
+	fi
+fi
+%endif
+
 %post
 %ifnos linux
 . /etc/profile
diff --git a/xCATsn/xCATsn.spec b/xCATsn/xCATsn.spec
index 0cf43a7c6..1b4808229 100644
--- a/xCATsn/xCATsn.spec
+++ b/xCATsn/xCATsn.spec
@@ -80,8 +80,19 @@ mkdir -p $RPM_BUILD_ROOT/opt/xcat/
 cp %{SOURCE3} $RPM_BUILD_ROOT/etc/xCATSN
 %endif
 
-%post
+%pre
+# only need to check on AIX
+%ifnos linux
+if [ -x /usr/sbin/emgr ]; then          # Check for emgr cmd
+	/usr/sbin/emgr -l 2>&1 |  grep -i xCAT   # Test for any xcat ifixes -  msg and exit if found
+	if [ $? = 0 ]; then
+		echo "Error: One or more xCAT emgr ifixes are installed. You must use the /usr/sbin/emgr command to uninstall each xCAT emgr ifix prior to RPM installation."
+		exit 2
+	fi
+fi
+%endif
 
+%post
 
 if [ "$1" = "1" ]; then #Only if installing for the first time..